FlightDecode

A real ADS-B (Mode S / 1090ES) transponder encode-then-decode round trip, computed live at build time by OnlyCSharp.ComputerNetworks.AdsB. A synthetic flight is generated deterministically from a seed, packed into genuine extended-squitter frames (CRC-24 and all), and decoded back through the unmodified library decoder.

Synthetic flight seed: 20260719 (deterministic - same seed, same aircraft every run).

1. Identification frame

FieldValue
Hex frame8D372C0F20E41CB64711A0B5D1EE
Decoded callsign9A26Q1F
CRC OKyes

2. Position frames (even + odd CPR pair)

FieldValue
Even hex8D372C0F586DB19ADC417098C19A
Odd hex8D372C0F586DB52D863534C21D8D
Even CRC OKyes
Odd CRC OKyes
Global position (lat, lon)38.4074, 8.6385
Altitude20,875 ft

3. Velocity frame

FieldValue
Hex frame8D372C0F9900E198083C00C9AED0
CRC OKyes
Ground speed294.38 kt
Track130.45 deg
Vertical rate-896 ft/min

Summary

9A26Q1F is near 38.41 deg N, 8.64 deg E at 20,875ft, doing 294kt heading 130 deg, descending 896ft/min.